> I put a large DC current thru a Radio Shack tape degausser to magnetize
> the speedo's bar to a high field strength, then carefully used AC on the
> degausser to decrease the field strength till the speedo read correctly.
> < -Dave Plumpe
> You've GOT to be kidding! High-tech meets Brit-tech! I should think
> that the the PROPER way to calibrate a Jaeger or Smiths speedometer
> would involve something like taking a small length of narrow diameter
> hose and feeding in through the back of the Speedometer and driving
> around while blowing into the hose with your ear to the instrument in
> order to listen for the proper change in pitch.
No, I think that the classic method of demagnetization involves orienting the
magnet in the E-W direction and whacking it with a ball-pein hammer.
This must be done with great care and precision lest the mounting hardware
deform beyond usability.
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John R. Lupien
lupienj@wal.hp.com
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